Fragrance
The alcohol is three problems at once
Updated
It needs a federal permit before you start, it makes the product a flammable liquid to ship, and it is a solvent living inside your own package. Only the third one is about the bottle, and it is the reason every container on this shelf is glass.
The alcohol
A permit, a hazard class and a solvent.
The fitment
Sprayers, roll-ons and droppers.
What goes wrong
Named failures, with the cause for each.
Containers
63 glass bottles, and what fits them.
Written from 27 CFR 20.41, 49 CFR 173.150 and measured catalog data. Every page names its source.